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AS NZS 2312-2002 Guide to the protection of structural steel against atmospheric corrosion by the use of prot

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					                                                                                                                               AS/NZS 2312:2002
                                                                                                                               (Incorporating Amendment No. 1)
                                                                                           AS/NZS 2312




                                                                                                         Australian/New Zealand Standard™
This is a free 8 page sample. Access the full version at http://infostore.saiglobal.com.




                                                                                                         Guide to the protection of structural
                                                                                                         steel against atmospheric corrosion by
                                                                                                         the use of protective coatings
                                                                                           AS/NZS 2312:2002
                                                                                           This Joint Australian/New Zealand Standard was prepared by Joint Technical
                                                                                           Committee MT-014, Corrosion of Metals. It was approved on behalf of the Council
                                                                                           of Standards Australia on 14 October 2002 and on behalf of the Council of
                                                                                           Standards New Zealand on 12 November 2002. It was published on
                                                                                           28 November 2002.



                                                                                           The following are represented on Committee MT-014:
                                                                                           Australasian Corrosion Association
                                                                                           Australian Aluminium Council
                                                                                           Australian Chamber of Commerce and Industry
                                                                                           Australian Electrolysis Committee
                                                                                           Australian Gas Association
                                                                                           Australian Institute of Steel Construction
                                                                                           Australian Pipeline Industry Association
                                                                                           AUSTROADS
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                                                                                           Bureau of Steel Manufacturers of Australia
                                                                                           Corrosion Prevention Centre
                                                                                           Department of Defence, Australia
                                                                                           Division of Building, Construction and Engineering, CSIRO
                                                                                           Galvanizers Association of Australia
                                                                                           Hunter Water Australia
                                                                                           Ministry of Economic Development (New Zealand)
                                                                                           New Zealand Abrasive Blasting Association
                                                                                           United Water International
                                                                                           Water Corporation Western Australia

                                                                                           Additional interests participating in the preparation of this Standard:

                                                                                           The Australian Paint Approval Scheme
                                                                                           Australian Paint Manufacturer’s Federation
                                                                                           Building Research Association of New Zealand
                                                                                           Corrosion engineers and consultants
                                                                                           Metal spray suppliers
                                                                                           Paint manufacturers and suppliers
                                                                                           Steel Institute of Australia



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                                                                                                    This Standard was issued in draft form for comment as DR 00258.
                                                                                                                                                 AS/NZS 2312:2002
                                                                                                                                                 (Incorporating Amendment No. 1)




                                                                                           Australian/New Zealand Standard™
This is a free 8 page sample. Access the full version at http://infostore.saiglobal.com.




                                                                                           Guide to the protection of structural
                                                                                           steel against atmospheric corrosion by
                                                                                           the use of protective coatings




                                                                                           Originated as part of MA 1.5—1967.
                                                                                           Previous edition AS/NZS 2312:1994.
                                                                                           Fourth edition 2002.
                                                                                           Reissued incorporating Amendment No. 1 (August 2004)




                                                                                           COPYRIGHT
                                                                                           © Standards Australia/Standards New Zealand
                                                                                           All rights are reserved. No part of this work may be reproduced or copied in any form or by any
                                                                                           means, electronic or mechanical, including photocopying, without the written permission of the
                                                                                           publisher.
                                                                                           Jointly published by Standards Australia International Ltd, GPO Box 5420, Sydney, NSW 2001
                                                                                           and Standards New Zealand, Private Bag 2439, Wellington 6020
                                                                                           ISBN 0 7337 4887 2
                                                                                           AS/NZS 2312:2002                                    2




                                                                                                                                          PREFACE
                                                                                                 This Standard was prepared by the Joint Standards Australia/Standards New Zealand
                                                                                                 Committee MT-014, Corrosion of Metals, to supersede AS/NZS 2312:1994, Guide to the
                                                                                                 protection of iron and steel against exterior atmospheric corrosion.
                                                                                                 This Standard incorporates Amendment 1 (August 2004). The changes required by the
                                                                                                 Amendment are indicated in the text by a marginal bar and amendment number against the
                                                                                                 clause, note, table, figure, or part thereof affected.
                                                                                                 The objective of this Standard is to provide guidance for architects, engineers, builders, the
                                                                                                 surface coating industry and users of protective services in general, on coating systems for
                                                                                                 the protection of steel work against corrosion. The designer can choose from a selection of
                                                                                                 systems based on expected service life to first maintenance for various environments. The
                                                                                                 systems recommended herein are based on good industrial practice and usage; however,
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                                                                                                 local knowledge of any corrosion problem should influence the decisions taken.
                                                                                                 Many of the system options will provide equal performance in the field. The system chosen
                                                                                                 will depend on many factors including location, material supply, available equipment,
                                                                                                 labour and cost.
                                                                                                 It is necessary to refer to each Section of this Standard when a specification for an
                                                                                                 appropriate system is being prepared.
                                                                                                 This edition of the Standard has been expanded to cover non-atmospheric environments in
                                                                                                 addition to exterior atmospheric environments.
                                                                                                 In providing recommendations on up-to-date protection systems, the Committee is aware of
                                                                                                 the large number of systems used commercially, but, to avoid confusion, has included only
                                                                                                 a limited range of systems for each type of environment.
                                                                                                 The Committee acknowledges the developments which are taking place in the protection of
                                                                                                 structural steel work and will continue to monitor these in order to make changes to future
                                                                                                 editions of this Standard as may become necessary.
                                                                                                 In preparing this revision, cognizance was taken of the International Standard
                                                                                                 ISO 9223:1992, Corrosion of metals and alloys—Corrosivity of atmospheres—
                                                                                                 Classification. Cognizance was also taken of a number of the draft International Standards
                                                                                                 being prepared to become part of the ISO 12944 series of Standards, Paints and varnishes—
                                                                                                 Corrosion protection of steel structures by protective paint systems. These Standards were
                                                                                                 not adopted as most of the paint systems they specify are not used in Australia and New
                                                                                                 Zealand.
                                                                                                 The term ‘informative’ has been used in this Standard to define the application of the
                                                                                                 appendix to which it applies. An ‘informative’ appendix is only for information and
                                                                                                 guidance.
                                                                                                                                                              3                                                     AS/NZS 2312:2002




                                                                                                                                                    CONTENTS

                                                                                                                                                                                                                           Page

                                                                                           SECTION 1 SCOPE AND GENERAL
                                                                                             1.1 SCOPE ........................................................................................................................ 6
                                                                                             1.2 NEED FOR CORROSION PROTECTION ................................................................. 7
                                                                                             1.3 USE OF THIS STANDARD........................................................................................ 7
                                                                                             1.4 REFERENCED DOCUMENTS .................................................................................. 7
                                                                                             1.5 DEFINITIONS .......................................................................................................... 10
                                                                                             1.6 DURABILITY CONSIDERATIONS ........................................................................ 11
                                                                                             1.7 DESIGNATION OF PROTECTION SYSTEMS....................................................... 11
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                                                                                           SECTION 2 CLASSIFICATION OF ENVIRONMENTS
                                                                                             2.1 GENERAL ................................................................................................................ 13
                                                                                             2.2 MICRO-ENVIRONMENTS ...................................................................................... 13
                                                                                             2.3 ATMOSPHERIC CORROSIVITY CATEGORIES ................................................... 14
                                                                                             2.4 OTHER ENVIRONMENTS ...................................................................................... 15

                                                                                           SECTION 3 PLANNING AND DESIGN FOR CORROSION PROTECTION
                                                                                             3.1 SCOPE AND GENERAL .......................................................................................... 16
                                                                                             3.2 PLANNING............................................................................................................... 17
                                                                                             3.3 DESIGN .................................................................................................................... 17

                                                                                           SECTION 4 SURFACE PREPARATION TREATMENTS
                                                                                             4.1 GENERAL ................................................................................................................ 35
                                                                                             4.2 SURFACE PREPARATION TREATMENTS........................................................... 35
                                                                                             4.3 THE PROTECTION OF STEEL DURING EXTENDED FABRICATION............... 40
                                                                                             4.4 RUST CONVERSION............................................................................................... 40

                                                                                           SECTION 5 METALLIC COATINGS FOR CORROSION PROTECTION
                                                                                             5.1 GENERAL ................................................................................................................ 41
                                                                                             5.2 METAL SPRAY COATINGS ................................................................................... 41
                                                                                             5.3 HOT-DIP GALVANIZED COATINGS (BATCH PROCESS).................................. 44
                                                                                             5.4 SECTIONS PRODUCED FROM PRE-GALVANIZED STRIP ................................ 47
                                                                                             5.5 SPECIALIZED HOT DIP GALVANIZED PRODUCTS .......................................... 48
                                                                                             5.6 IN-LINE GALVANIZED PRODUCTS..................................................................... 49
                                                                                             5.7 STRUCTURE SECTIONS MANUFACTURED FROM ELECTROGALVANIZED
                                                                                                  STRIP ........................................................................................................................ 49
                                                                                             5.8 PAINT SYSTEMS FOR CONTINUOUSLY, SPECIALIZED AND
                                                                                                  ELECTROGALVANIZED PRODUCTS................................................................... 50
                                                                                             5.9 THE USE OF ROOFING AND CLADDING MATERIALS..................................... 50
                                                                                             5.10 ELECTROPLATED COATINGS.............................................................................. 50

                                                                                           SECTION 6 PAINT COATING SYSTEMS FOR CORROSION PROTECTION
                                                                                             6.1 GENERAL ................................................................................................................ 52
                                                                                             6.2 DURABILITY OF PAINT COATINGS.................................................................... 52
                                                                                             6.3 COATING SYSTEMS FOR ATMOSPHERIC ENVIRONMENTS .......................... 52
                                                                                           AS/NZS 2312:2002                                                        4




                                                                                                                                                                                                                                Page

                                                                                                 SECTION 7 FACTORS INFLUENCING COATING SELECTION
                                                                                                   7.1 GENERAL ................................................................................................................ 63
                                                                                                   7.2 SUBSTRATE AND SURFACE CONDITION .......................................................... 63
                                                                                                   7.3 ENVIRONMENT ...................................................................................................... 63
                                                                                                   7.4 SYSTEM LIFE .......................................................................................................... 64
                                                                                                   7.5 DESIGN .................................................................................................................... 64
                                                                                                   7.6 SHOP OR SITE APPLICATION............................................................................... 65
                                                                                                   7.7 COLOUR AND APPEARANCE............................................................................... 66
                                                                                                   7.8 APPLICATION METHOD........................................................................................ 66
                                                                                                   7.9 CONDITIONS DURING APPLICATION ................................................................ 67
                                                                                                   7.10 SURFACE PREPARATION ..................................................................................... 67
                                                                                                   7.11 PREVIOUS EXPERIENCE....................................................................................... 67
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                                                                                                   7.12 MAINTENANCE CONSIDERATIONS.................................................................... 67
                                                                                                   7.13 INSPECTION ............................................................................................................ 68
                                                                                                   7.14 SAFETY AND ENVIRONMENTAL CONSTRAINTS ............................................ 68
                                                                                                   7.15 COST......................................................................................................................... 68

                                                                                                 SECTION 8 PAINTING AND PAINT APPLICATION METHODS
                                                                                                   8.1 GENERAL ................................................................................................................ 69
                                                                                                   8.2 PAINT STORAGE .................................................................................................... 69
                                                                                                   8.3 MIXING AND THINNING OF PAINT .................................................................... 69
                                                                                                   8.4 TYPE AND CONDITION OF THE SUBSTRATE ................................................... 70
                                                                                                   8.5 PAINTING CONDITIONS ....................................................................................... 70
                                                                                                   8.6 SEQUENCE OF OPERATIONS ............................................................................... 72
                                                                                                   8.7 METHODS OF APPLICATION ............................................................................... 72
                                                                                                   8.8 STANDARD OF WORKMANSHIP ......................................................................... 73
                                                                                                   8.9 TIME REQUIREMENTS .......................................................................................... 73
                                                                                                   8.10 PAINT SPREADING RATE AND THICKNESS...................................................... 74

                                                                                                 SECTION 9 OTHER SYSTEMS FOR CORROSION PROTECTION
                                                                                                   9.1 POWDER COATINGS.............................................................................................. 75
                                                                                                   9.2 WRAPPING TAPES ................................................................................................. 75

                                                                                                 SECTION 10 MAINTENANCE OF PROTECTIVE COATING SYSTEMS
                                                                                                   10.1 GENERAL ................................................................................................................ 77
                                                                                                   10.2 CRITERIA FOR ASSESSING WHEN TO PAINT OR REPAIR .............................. 77
                                                                                                   10.3 PRETREATMENT BEFORE REPAINTING............................................................ 78
                                                                                                   10.4 REPAINTING ........................................................................................................... 81
                                                                                                   10.5 REPAIRS AND REPAINTING OF WELDED STRUCTURES................................ 82

                                                                                                 SECTION 11 INSPECTION AND TESTING
                                                                                                   11.1 GENERAL ................................................................................................................ 85
                                                                                                   11.2 REQUIREMENTS AND AUTHORITY OF INSPECTORS ..................................... 85
                                                                                                   11.3 PRELIMINARY DISCUSSIONS .............................................................................. 85
                                                                                                   11.4 DUTIES OF INSPECTORS ...................................................................................... 86
                                                                                                   11.5 FINAL INSPECTION ............................................................................................... 88
                                                                                                   11.6 RECORDS AND INSPECTION REPORT................................................................ 89
                                                                                                   11.7 GUIDANCE ON THE USE OF TESTING EQUIPMENT ........................................ 89
                                                                                                                                                               5                                                       AS/NZS 2312:2002



                                                                                                                                                                                                                              Page

                                                                                           SECTION 12 PREPARATION OF COATING SPECIFICATIONS
                                                                                             12.1 GENERAL ................................................................................................................ 90
                                                                                             12.2 CONTENT OF A SPECIFICATION ........................................................................ 90

                                                                                           SECTION 13 HEALTH AND SAFETY
                                                                                             13.1 GENERAL ................................................................................................................ 96
                                                                                             13.2 THE PAINTED SURFACE ....................................................................................... 96
                                                                                             13.3 FLAMMABILITY..................................................................................................... 96
                                                                                             13.4 EYE PROTECTION.................................................................................................. 96
                                                                                             13.5 RESPIRATORS......................................................................................................... 96
                                                                                             13.6 NOISE ....................................................................................................................... 97
                                                                                             13.7 HANDLING .............................................................................................................. 97
                                                                                             13.8 WORKING IN A CONFINED SPACE ..................................................................... 97
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                                                                                             13.9 SURFACE PREPARATION ..................................................................................... 97
                                                                                             13.10 APPLICATION OF PAINT....................................................................................... 97
                                                                                             13.11 STORAGE OF PAINT .............................................................................................. 98
                                                                                             13.12 WELDING ................................................................................................................ 99
                                                                                             13.13 BURNING OF PAINTED SURFACES..................................................................... 99
                                                                                             13.14 COATINGS NOT RECOMMENDED....................................................................... 99

                                                                                           APPENDICES
                                                                                               A        GUIDANCE ON THE USE OF THIS STANDARD ............................................... 101
                                                                                               B        ADVICE ON ATMOSPHERIC CORROSION OF STEEL IN
                                                                                                        AUSTRALASIAN CLIMATES .............................................................................. 106
                                                                                               C        NON-ATMOSPHERIC AND HOT ENVIRONMENTS.......................................... 110
                                                                                               D        DESCRIPTION OF PAINT TYPES ........................................................................ 120
                                                                                               E        INDEX .................................................................................................................... 137
                                                                                           AS/NZS 2312:2002                                     6




                                                                                                              STANDARDS AUSTRALIA/STANDARDS NEW ZEALAND

                                                                                                                            Australian/New Zealand Standard
                                                                                                       Guide to the protection of structural steel against atmospheric
                                                                                                                 corrosion by the use of protective coatings



                                                                                                              SECT ION           1       SCOPE         AND       GENERA L

                                                                                                 1.1 SCOPE
                                                                                                 This Standard provides guidelines for the selection and specification of coating systems for
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                                                                                                 the protection of structural steel work against interior and exterior atmospheric
                                                                                                 environments.
                                                                                                 The Standard specifically covers the following subjects:
                                                                                                 (a)   Guidance on the use of the Standard.
                                                                                                 (b)   Classification of atmospheric and non-atmospheric environments.
                                                                                                 (c)   Planning and design for corrosion protection.
                                                                                                 (d)   Surface preparation treatments.
                                                                                                 (e)   Metallic coatings.
                                                                                                 (f)   Paint coating systems and methods of paint application.
                                                                                                 (g)   Factors influencing coating selection.
                                                                                                 (h)   Powder coatings and wrapping tapes for corrosion protection.
                                                                                                 (i)   Maintenance of protective coating systems.
                                                                                                 (j)   Inspection and testing.
                                                                                                 (k)   Guidance on the preparation of coating specifications.
                                                                                                 (l)   Health and safety requirements.
                                                                                                 (m)   Economics of corrosion protection.
                                                                                                 This Standard covers the protection of structural steel work against interior and exterior
                                                                                                 atmospheric corrosion and also the protection of items of equipment manufactured from
                                                                                                 steel which are exposed to exterior atmospheric conditions.
                                                                                                 The Standard also covers, to a limited extent, the protection of steel work which is
                                                                                                 completely immersed in water or buried in soil, or which is subject to atmospheres severely
                                                                                                 contaminated with acidic or other chemical vapours such as may be encountered in some
                                                                                                 chemical manufacturing plants, and also the protection of ships. The systems recommended
                                                                                                 in this Standard can also be used on internal structures where wet or damp areas exist.
                                                                                                 It is necessary to understand that the systems recommended have been selected for guidance
                                                                                                 only and that life expectancy to first major maintenance is an estimate only. In practice,
                                                                                                 some minor maintenance may be required.
                                                                                                 Because particular coating formulations and micro-climates vary, the user of this Standard
                                                                                                 is advised to confirm with the manufacturer or supplier, that the selected system is suitable
                                                                                                 for the task and can be reasonably expected to protect the steel for a specified time.



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                                                                                                             AS/NZS 2312:2002, Guide to the protection of
                                                                                                             structural steel against atmospheric corrosion by
                                                                                                             the use of protective coatings
This is a free 8 page sample. Access the full version at http://infostore.saiglobal.com.




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